1 /* $NetBSD: rpcb_clnt.c,v 1.24 2008/07/25 14:05:25 christos Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 /* 32 * Copyright (c) 1986-1991 by Sun Microsystems Inc. 33 */ 34 35 /* #ident "@(#)rpcb_clnt.c 1.27 94/04/24 SMI" */ 36 37 #include <sys/cdefs.h> 38 #if defined(LIBC_SCCS) && !defined(lint) 39 #if 0 40 static char sccsid[] = "@(#)rpcb_clnt.c 1.30 89/06/21 Copyr 1988 Sun Micro"; 41 #else 42 __RCSID("$NetBSD: rpcb_clnt.c,v 1.24 2008/07/25 14:05:25 christos Exp $"); 43 #endif 44 #endif 45 46 /* 47 * rpcb_clnt.c 48 * interface to rpcbind rpc service. 49 * 50 * Copyright (C) 1988, Sun Microsystems, Inc. 51 */ 52 53 #include "namespace.h" 54 #include "reentrant.h" 55 #include <sys/types.h> 56 #include <sys/socket.h> 57 #include <sys/un.h> 58 #include <sys/utsname.h> 59 #include <rpc/rpc.h> 60 #include <rpc/rpcb_prot.h> 61 #include <rpc/nettype.h> 62 #include <netconfig.h> 63 #ifdef PORTMAP 64 #include <netinet/in.h> /* FOR IPPROTO_TCP/UDP definitions */ 65 #include <rpc/pmap_prot.h> 66 #endif 67 #include <assert.h> 68 #include <errno.h> 69 #include <netdb.h> 70 #include <stdio.h> 71 #include <stdlib.h> 72 #include <string.h> 73 #include <syslog.h> 74 #include <unistd.h> 75 76 #include "rpc_internal.h" 77 78 #ifdef __weak_alias 79 __weak_alias(rpcb_set,_rpcb_set) 80 __weak_alias(rpcb_unset,_rpcb_unset) 81 __weak_alias(rpcb_getmaps,_rpcb_getmaps) 82 __weak_alias(rpcb_rmtcall,_rpcb_rmtcall) 83 __weak_alias(rpcb_gettime,_rpcb_gettime) 84 __weak_alias(rpcb_taddr2uaddr,_rpcb_taddr2uaddr) 85 __weak_alias(rpcb_uaddr2taddr,_rpcb_uaddr2taddr) 86 #endif 87 88 static struct timeval tottimeout = { 60, 0 }; 89 static const struct timeval rmttimeout = { 3, 0 }; 90 91 static const char nullstring[] = "\000"; 92 93 #define CACHESIZE 6 94 95 struct address_cache { 96 char *ac_host; 97 char *ac_netid; 98 char *ac_uaddr; 99 struct netbuf *ac_taddr; 100 struct address_cache *ac_next; 101 }; 102 103 static struct address_cache *front; 104 static int cachesize; 105 106 #define CLCR_GET_RPCB_TIMEOUT 1 107 #define CLCR_SET_RPCB_TIMEOUT 2 108 109 110 extern int __rpc_lowvers; 111 112 static struct address_cache *check_cache __P((const char *, const char *)); 113 static void delete_cache __P((struct netbuf *)); 114 static void add_cache __P((const char *, const char *, struct netbuf *, 115 char *)); 116 static CLIENT *getclnthandle __P((const char *, const struct netconfig *, 117 char **)); 118 static CLIENT *local_rpcb __P((void)); 119 static struct netbuf *got_entry __P((rpcb_entry_list_ptr, 120 const struct netconfig *)); 121 122 /* 123 * This routine adjusts the timeout used for calls to the remote rpcbind. 124 * Also, this routine can be used to set the use of portmapper version 2 125 * only when doing rpc_broadcasts 126 * These are private routines that may not be provided in future releases. 127 */ 128 bool_t 129 __rpc_control(request, info) 130 int request; 131 void *info; 132 { 133 134 _DIAGASSERT(info != NULL); 135 136 switch (request) { 137 case CLCR_GET_RPCB_TIMEOUT: 138 *(struct timeval *)info = tottimeout; 139 break; 140 case CLCR_SET_RPCB_TIMEOUT: 141 tottimeout = *(struct timeval *)info; 142 break; 143 case CLCR_SET_LOWVERS: 144 __rpc_lowvers = *(int *)info; 145 break; 146 case CLCR_GET_LOWVERS: 147 *(int *)info = __rpc_lowvers; 148 break; 149 default: 150 return (FALSE); 151 } 152 return (TRUE); 153 } 154 155 /* 156 * It might seem that a reader/writer lock would be more reasonable here. 157 * However because getclnthandle(), the only user of the cache functions, 158 * may do a delete_cache() operation if a check_cache() fails to return an 159 * address useful to clnt_tli_create(), we may as well use a mutex. 160 */ 161 /* 162 * As it turns out, if the cache lock is *not* a reader/writer lock, we will 163 * block all clnt_create's if we are trying to connect to a host that's down, 164 * since the lock will be held all during that time. 165 */ 166 #ifdef _REENTRANT 167 extern rwlock_t rpcbaddr_cache_lock; 168 #endif 169 170 /* 171 * The routines check_cache(), add_cache(), delete_cache() manage the 172 * cache of rpcbind addresses for (host, netid). 173 */ 174 175 static struct address_cache * 176 check_cache(host, netid) 177 const char *host, *netid; 178 { 179 struct address_cache *cptr; 180 181 _DIAGASSERT(host != NULL); 182 _DIAGASSERT(netid != NULL); 183 184 /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 185 186 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 187 if (!strcmp(cptr->ac_host, host) && 188 !strcmp(cptr->ac_netid, netid)) { 189 #ifdef ND_DEBUG 190 fprintf(stderr, "Found cache entry for %s: %s\n", 191 host, netid); 192 #endif 193 return (cptr); 194 } 195 } 196 return NULL; 197 } 198 199 static void 200 delete_cache(addr) 201 struct netbuf *addr; 202 { 203 struct address_cache *cptr, *prevptr = NULL; 204 205 _DIAGASSERT(addr != NULL); 206 207 /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ 208 for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { 209 if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { 210 free(cptr->ac_host); 211 free(cptr->ac_netid); 212 free(cptr->ac_taddr->buf); 213 free(cptr->ac_taddr); 214 if (cptr->ac_uaddr) 215 free(cptr->ac_uaddr); 216 if (prevptr) 217 prevptr->ac_next = cptr->ac_next; 218 else 219 front = cptr->ac_next; 220 free(cptr); 221 cachesize--; 222 break; 223 } 224 prevptr = cptr; 225 } 226 } 227 228 static void 229 add_cache(host, netid, taddr, uaddr) 230 const char *host, *netid; 231 char *uaddr; 232 struct netbuf *taddr; 233 { 234 struct address_cache *ad_cache, *cptr, *prevptr; 235 236 _DIAGASSERT(host != NULL); 237 _DIAGASSERT(netid != NULL); 238 /* uaddr may be NULL */ 239 /* taddr may be NULL ??? */ 240 241 ad_cache = malloc(sizeof(*ad_cache)); 242 if (!ad_cache) { 243 return; 244 } 245 ad_cache->ac_host = strdup(host); 246 ad_cache->ac_netid = strdup(netid); 247 ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; 248 ad_cache->ac_taddr = malloc(sizeof(*ad_cache->ac_taddr)); 249 if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || 250 (uaddr && !ad_cache->ac_uaddr)) { 251 goto out; 252 } 253 ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; 254 ad_cache->ac_taddr->buf = malloc(taddr->len); 255 if (ad_cache->ac_taddr->buf == NULL) { 256 out: 257 if (ad_cache->ac_host) 258 free(ad_cache->ac_host); 259 if (ad_cache->ac_netid) 260 free(ad_cache->ac_netid); 261 if (ad_cache->ac_uaddr) 262 free(ad_cache->ac_uaddr); 263 if (ad_cache->ac_taddr) 264 free(ad_cache->ac_taddr); 265 free(ad_cache); 266 return; 267 } 268 memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); 269 #ifdef ND_DEBUG 270 fprintf(stderr, "Added to cache: %s : %s\n", host, netid); 271 #endif 272 273 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ 274 275 rwlock_wrlock(&rpcbaddr_cache_lock); 276 if (cachesize < CACHESIZE) { 277 ad_cache->ac_next = front; 278 front = ad_cache; 279 cachesize++; 280 } else { 281 /* Free the last entry */ 282 cptr = front; 283 prevptr = NULL; 284 while (cptr->ac_next) { 285 prevptr = cptr; 286 cptr = cptr->ac_next; 287 } 288 289 #ifdef ND_DEBUG 290 fprintf(stderr, "Deleted from cache: %s : %s\n", 291 cptr->ac_host, cptr->ac_netid); 292 #endif 293 free(cptr->ac_host); 294 free(cptr->ac_netid); 295 free(cptr->ac_taddr->buf); 296 free(cptr->ac_taddr); 297 if (cptr->ac_uaddr) 298 free(cptr->ac_uaddr); 299 300 if (prevptr) { 301 prevptr->ac_next = NULL; 302 ad_cache->ac_next = front; 303 front = ad_cache; 304 } else { 305 front = ad_cache; 306 ad_cache->ac_next = NULL; 307 } 308 free(cptr); 309 } 310 rwlock_unlock(&rpcbaddr_cache_lock); 311 } 312 313 /* 314 * This routine will return a client handle that is connected to the 315 * rpcbind. Returns NULL on error and free's everything. 316 */ 317 static CLIENT * 318 getclnthandle(host, nconf, targaddr) 319 const char *host; 320 const struct netconfig *nconf; 321 char **targaddr; 322 { 323 CLIENT *client; 324 struct netbuf *addr, taddr; 325 struct netbuf addr_to_delete; 326 struct __rpc_sockinfo si; 327 struct addrinfo hints, *res, *tres; 328 struct address_cache *ad_cache; 329 char *tmpaddr; 330 331 _DIAGASSERT(host != NULL); 332 _DIAGASSERT(nconf != NULL); 333 /* targaddr may be NULL */ 334 335 /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ 336 337 /* Get the address of the rpcbind. Check cache first */ 338 client = NULL; 339 addr_to_delete.len = 0; 340 addr_to_delete.buf = NULL; 341 rwlock_rdlock(&rpcbaddr_cache_lock); 342 ad_cache = check_cache(host, nconf->nc_netid); 343 if (ad_cache != NULL) { 344 addr = ad_cache->ac_taddr; 345 client = clnt_tli_create(RPC_ANYFD, nconf, addr, 346 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 347 if (client != NULL) { 348 if (targaddr) 349 *targaddr = ad_cache->ac_uaddr; 350 rwlock_unlock(&rpcbaddr_cache_lock); 351 return (client); 352 } 353 addr_to_delete.len = addr->len; 354 addr_to_delete.buf = malloc(addr->len); 355 if (addr_to_delete.buf == NULL) { 356 addr_to_delete.len = 0; 357 } else { 358 memcpy(addr_to_delete.buf, addr->buf, addr->len); 359 } 360 } 361 rwlock_unlock(&rpcbaddr_cache_lock); 362 if (addr_to_delete.len != 0) { 363 /* 364 * Assume this may be due to cache data being 365 * outdated 366 */ 367 rwlock_wrlock(&rpcbaddr_cache_lock); 368 delete_cache(&addr_to_delete); 369 rwlock_unlock(&rpcbaddr_cache_lock); 370 free(addr_to_delete.buf); 371 } 372 if (!__rpc_nconf2sockinfo(nconf, &si)) { 373 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 374 return NULL; 375 } 376 377 memset(&hints, 0, sizeof hints); 378 hints.ai_family = si.si_af; 379 hints.ai_socktype = si.si_socktype; 380 hints.ai_protocol = si.si_proto; 381 382 #ifdef CLNT_DEBUG 383 printf("trying netid %s family %d proto %d socktype %d\n", 384 nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); 385 #endif 386 387 if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { 388 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; 389 return NULL; 390 } 391 392 for (tres = res; tres != NULL; tres = tres->ai_next) { 393 taddr.buf = tres->ai_addr; 394 taddr.len = taddr.maxlen = tres->ai_addrlen; 395 396 #ifdef ND_DEBUG 397 { 398 char *ua; 399 400 ua = taddr2uaddr(nconf, &taddr); 401 fprintf(stderr, "Got it [%s]\n", ua); 402 free(ua); 403 } 404 #endif 405 406 #ifdef ND_DEBUG 407 { 408 int i; 409 410 fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", 411 taddr.len, taddr.maxlen); 412 fprintf(stderr, "\tAddress is "); 413 for (i = 0; i < taddr.len; i++) 414 fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); 415 fprintf(stderr, "\n"); 416 } 417 #endif 418 client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, 419 (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); 420 #ifdef ND_DEBUG 421 if (! client) { 422 clnt_pcreateerror("rpcbind clnt interface"); 423 } 424 #endif 425 426 if (client) { 427 tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; 428 add_cache(host, nconf->nc_netid, &taddr, tmpaddr); 429 if (targaddr) 430 *targaddr = tmpaddr; 431 break; 432 } 433 } 434 freeaddrinfo(res); 435 return (client); 436 } 437 438 /* XXX */ 439 #define IN4_LOCALHOST_STRING "127.0.0.1" 440 #define IN6_LOCALHOST_STRING "::1" 441 442 /* 443 * This routine will return a client handle that is connected to the local 444 * rpcbind. Returns NULL on error and free's everything. 445 */ 446 static CLIENT * 447 local_rpcb() 448 { 449 CLIENT *client; 450 static struct netconfig *loopnconf; 451 static const char *hostname; 452 #ifdef _REENTRANT 453 extern mutex_t loopnconf_lock; 454 #endif 455 int sock; 456 size_t tsize; 457 struct netbuf nbuf; 458 struct sockaddr_un sun; 459 460 /* 461 * Try connecting to the local rpcbind through a local socket 462 * first. If this doesn't work, try all transports defined in 463 * the netconfig file. 464 */ 465 memset(&sun, 0, sizeof sun); 466 sock = socket(AF_LOCAL, SOCK_STREAM, 0); 467 if (sock < 0) 468 goto try_nconf; 469 sun.sun_family = AF_LOCAL; 470 strcpy(sun.sun_path, _PATH_RPCBINDSOCK); 471 nbuf.len = sun.sun_len = SUN_LEN(&sun); 472 nbuf.maxlen = sizeof (struct sockaddr_un); 473 nbuf.buf = &sun; 474 475 tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); 476 client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, 477 (rpcvers_t)RPCBVERS, tsize, tsize); 478 479 if (client != NULL) { 480 /* XXX - mark the socket to be closed in destructor */ 481 (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); 482 return client; 483 } 484 485 /* XXX - nobody needs this socket anymore, free the descriptor */ 486 close(sock); 487 488 try_nconf: 489 490 /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ 491 mutex_lock(&loopnconf_lock); 492 if (loopnconf == NULL) { 493 struct netconfig *nconf, *tmpnconf = NULL; 494 void *nc_handle; 495 int fd; 496 497 nc_handle = setnetconfig(); 498 if (nc_handle == NULL) { 499 /* fails to open netconfig file */ 500 syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); 501 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 502 mutex_unlock(&loopnconf_lock); 503 return (NULL); 504 } 505 while ((nconf = getnetconfig(nc_handle)) != NULL) { 506 #ifdef INET6 507 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || 508 #else 509 if (( 510 #endif 511 strcmp(nconf->nc_protofmly, NC_INET) == 0) && 512 (nconf->nc_semantics == NC_TPI_COTS || 513 nconf->nc_semantics == NC_TPI_COTS_ORD)) { 514 fd = __rpc_nconf2fd(nconf); 515 /* 516 * Can't create a socket, assume that 517 * this family isn't configured in the kernel. 518 */ 519 if (fd < 0) 520 continue; 521 close(fd); 522 tmpnconf = nconf; 523 if (!strcmp(nconf->nc_protofmly, NC_INET)) 524 hostname = IN4_LOCALHOST_STRING; 525 else 526 hostname = IN6_LOCALHOST_STRING; 527 } 528 } 529 if (tmpnconf == NULL) { 530 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 531 mutex_unlock(&loopnconf_lock); 532 return (NULL); 533 } 534 loopnconf = getnetconfigent(tmpnconf->nc_netid); 535 /* loopnconf is never freed */ 536 endnetconfig(nc_handle); 537 } 538 mutex_unlock(&loopnconf_lock); 539 client = getclnthandle(hostname, loopnconf, NULL); 540 return (client); 541 } 542 543 /* 544 * Set a mapping between program, version and address. 545 * Calls the rpcbind service to do the mapping. 546 */ 547 bool_t 548 rpcb_set(program, version, nconf, address) 549 rpcprog_t program; 550 rpcvers_t version; 551 const struct netconfig *nconf; /* Network structure of transport */ 552 const struct netbuf *address; /* Services netconfig address */ 553 { 554 CLIENT *client; 555 bool_t rslt = FALSE; 556 RPCB parms; 557 char uidbuf[32]; 558 559 /* parameter checking */ 560 if (nconf == NULL) { 561 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 562 return (FALSE); 563 } 564 if (address == NULL) { 565 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 566 return (FALSE); 567 } 568 client = local_rpcb(); 569 if (! client) { 570 return (FALSE); 571 } 572 573 /* convert to universal */ 574 parms.r_addr = taddr2uaddr(__UNCONST(nconf), __UNCONST(address)); 575 if (!parms.r_addr) { 576 CLNT_DESTROY(client); 577 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 578 return (FALSE); /* no universal address */ 579 } 580 parms.r_prog = program; 581 parms.r_vers = version; 582 parms.r_netid = nconf->nc_netid; 583 /* 584 * Though uid is not being used directly, we still send it for 585 * completeness. For non-unix platforms, perhaps some other 586 * string or an empty string can be sent. 587 */ 588 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 589 parms.r_owner = uidbuf; 590 591 CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, 592 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 593 (char *)(void *)&rslt, tottimeout); 594 595 CLNT_DESTROY(client); 596 free(parms.r_addr); 597 return (rslt); 598 } 599 600 /* 601 * Remove the mapping between program, version and netbuf address. 602 * Calls the rpcbind service to do the un-mapping. 603 * If netbuf is NULL, unset for all the transports, otherwise unset 604 * only for the given transport. 605 */ 606 bool_t 607 rpcb_unset(program, version, nconf) 608 rpcprog_t program; 609 rpcvers_t version; 610 const struct netconfig *nconf; 611 { 612 CLIENT *client; 613 bool_t rslt = FALSE; 614 RPCB parms; 615 char uidbuf[32]; 616 617 client = local_rpcb(); 618 if (! client) { 619 return (FALSE); 620 } 621 622 parms.r_prog = program; 623 parms.r_vers = version; 624 if (nconf) 625 parms.r_netid = nconf->nc_netid; 626 else { 627 parms.r_netid = __UNCONST(&nullstring[0]); /* unsets all */ 628 } 629 parms.r_addr = __UNCONST(&nullstring[0]); 630 (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); 631 parms.r_owner = uidbuf; 632 633 CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, 634 (char *)(void *)&parms, (xdrproc_t) xdr_bool, 635 (char *)(void *)&rslt, tottimeout); 636 637 CLNT_DESTROY(client); 638 return (rslt); 639 } 640 641 /* 642 * From the merged list, find the appropriate entry 643 */ 644 static struct netbuf * 645 got_entry(relp, nconf) 646 rpcb_entry_list_ptr relp; 647 const struct netconfig *nconf; 648 { 649 struct netbuf *na = NULL; 650 rpcb_entry_list_ptr sp; 651 rpcb_entry *rmap; 652 653 _DIAGASSERT(nconf != NULL); 654 655 for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { 656 rmap = &sp->rpcb_entry_map; 657 if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && 658 (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && 659 (nconf->nc_semantics == rmap->r_nc_semantics) && 660 (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) { 661 na = uaddr2taddr(nconf, rmap->r_maddr); 662 #ifdef ND_DEBUG 663 fprintf(stderr, "\tRemote address is [%s].\n", 664 rmap->r_maddr); 665 if (!na) 666 fprintf(stderr, 667 "\tCouldn't resolve remote address!\n"); 668 #endif 669 break; 670 } 671 } 672 return (na); 673 } 674 675 /* 676 * An internal function which optimizes rpcb_getaddr function. It also 677 * returns the client handle that it uses to contact the remote rpcbind. 678 * 679 * The algorithm used: If the transports is TCP or UDP, it first tries 680 * version 2 (portmap), 4 and then 3 (svr4). This order should be 681 * changed in the next OS release to 4, 2 and 3. We are assuming that by 682 * that time, version 4 would be available on many machines on the network. 683 * With this algorithm, we get performance as well as a plan for 684 * obsoleting version 2. 685 * 686 * For all other transports, the algorithm remains as 4 and then 3. 687 * 688 * XXX: Due to some problems with t_connect(), we do not reuse the same client 689 * handle for COTS cases and hence in these cases we do not return the 690 * client handle. This code will change if t_connect() ever 691 * starts working properly. Also look under clnt_vc.c. 692 */ 693 struct netbuf * 694 __rpcb_findaddr(program, version, nconf, host, clpp) 695 rpcprog_t program; 696 rpcvers_t version; 697 const struct netconfig *nconf; 698 const char *host; 699 CLIENT **clpp; 700 { 701 CLIENT *client = NULL; 702 RPCB parms; 703 enum clnt_stat clnt_st; 704 char *ua = NULL; 705 rpcvers_t vers; 706 struct netbuf *address = NULL; 707 rpcvers_t start_vers = RPCBVERS4; 708 struct netbuf servaddr; 709 710 /* nconf is handled below */ 711 _DIAGASSERT(host != NULL); 712 /* clpp may be NULL */ 713 714 /* parameter checking */ 715 if (nconf == NULL) { 716 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 717 return (NULL); 718 } 719 720 parms.r_addr = NULL; 721 722 #ifdef PORTMAP 723 /* Try version 2 for TCP or UDP */ 724 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { 725 u_short port = 0; 726 struct netbuf remote; 727 rpcvers_t pmapvers = 2; 728 struct pmap pmapparms; 729 730 /* 731 * Try UDP only - there are some portmappers out 732 * there that use UDP only. 733 */ 734 if (strcmp(nconf->nc_proto, NC_TCP) == 0) { 735 struct netconfig *newnconf; 736 737 if ((newnconf = getnetconfigent("udp")) == NULL) { 738 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 739 return (NULL); 740 } 741 client = getclnthandle(host, newnconf, &parms.r_addr); 742 freenetconfigent(newnconf); 743 } else { 744 client = getclnthandle(host, nconf, &parms.r_addr); 745 } 746 if (client == NULL) { 747 return (NULL); 748 } 749 750 /* Set the version */ 751 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&pmapvers); 752 pmapparms.pm_prog = program; 753 pmapparms.pm_vers = version; 754 pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? 755 IPPROTO_UDP : IPPROTO_TCP; 756 pmapparms.pm_port = 0; /* not needed */ 757 clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, 758 (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, 759 (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, 760 tottimeout); 761 if (clnt_st != RPC_SUCCESS) { 762 if ((clnt_st == RPC_PROGVERSMISMATCH) || 763 (clnt_st == RPC_PROGUNAVAIL)) 764 goto try_rpcbind; /* Try different versions */ 765 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 766 clnt_geterr(client, &rpc_createerr.cf_error); 767 goto error; 768 } else if (port == 0) { 769 address = NULL; 770 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 771 goto error; 772 } 773 port = htons(port); 774 CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&remote); 775 if (((address = malloc(sizeof(struct netbuf))) == NULL) || 776 ((address->buf = malloc(remote.len)) == NULL)) { 777 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 778 clnt_geterr(client, &rpc_createerr.cf_error); 779 if (address) { 780 free(address); 781 address = NULL; 782 } 783 goto error; 784 } 785 memcpy(address->buf, remote.buf, remote.len); 786 memcpy(&((char *)address->buf)[sizeof (short)], 787 (char *)(void *)&port, sizeof (short)); 788 address->len = address->maxlen = remote.len; 789 goto done; 790 } 791 #endif 792 793 try_rpcbind: 794 /* 795 * Now we try version 4 and then 3. 796 * We also send the remote system the address we used to 797 * contact it in case it can help to connect back with us 798 */ 799 parms.r_prog = program; 800 parms.r_vers = version; 801 parms.r_owner = __UNCONST(&nullstring[0]); /* not needed; */ 802 /* just for xdring */ 803 parms.r_netid = nconf->nc_netid; /* not really needed */ 804 805 /* 806 * If a COTS transport is being used, try getting address via CLTS 807 * transport. This works only with version 4. 808 * NOTE: This is being done for all transports EXCEPT LOOPBACK 809 * because with loopback the cost to go to a COTS is same as 810 * the cost to go through CLTS, plus you get the advantage of 811 * finding out immediately if the local rpcbind process is dead. 812 */ 813 #if 1 814 if ((nconf->nc_semantics == NC_TPI_COTS_ORD || 815 nconf->nc_semantics == NC_TPI_COTS) && 816 (strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0)) 817 #else 818 if (client != NULL) { 819 CLNT_DESTROY(client); 820 client = NULL; 821 } 822 if (nconf->nc_semantics == NC_TPI_CLTS) 823 #endif 824 { 825 void *handle; 826 struct netconfig *nconf_clts; 827 rpcb_entry_list_ptr relp = NULL; 828 829 if (client == NULL) { 830 /* This did not go through the above PORTMAP/TCP code */ 831 #if 1 832 if ((handle = __rpc_setconf("datagram_v")) != NULL) 833 #else 834 if ((handle = __rpc_setconf("circuit_v")) != NULL) 835 #endif 836 { 837 while ((nconf_clts = __rpc_getconf(handle)) 838 != NULL) { 839 if (strcmp(nconf_clts->nc_protofmly, 840 nconf->nc_protofmly) != 0) { 841 continue; 842 } 843 client = getclnthandle(host, nconf_clts, 844 &parms.r_addr); 845 break; 846 } 847 __rpc_endconf(handle); 848 } 849 if (client == NULL) 850 goto regular_rpcbind; /* Go the regular way */ 851 } else { 852 /* This is a UDP PORTMAP handle. Change to version 4 */ 853 vers = RPCBVERS4; 854 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 855 } 856 /* 857 * We also send the remote system the address we used to 858 * contact it in case it can help it connect back with us 859 */ 860 if (parms.r_addr == NULL) { 861 /* for XDRing */ 862 parms.r_addr = __UNCONST(&nullstring[0]); 863 } 864 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, 865 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 866 (xdrproc_t) xdr_rpcb_entry_list_ptr, 867 (char *)(void *)&relp, tottimeout); 868 if (clnt_st == RPC_SUCCESS) { 869 if ((address = got_entry(relp, nconf)) != NULL) { 870 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 871 (char *)(void *)&relp); 872 CLNT_CONTROL(client, CLGET_SVC_ADDR, 873 (char *)(void *)&servaddr); 874 __rpc_fixup_addr(address, &servaddr); 875 goto done; 876 } 877 /* Entry not found for this transport */ 878 xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, 879 (char *)(void *)&relp); 880 /* 881 * XXX: should have perhaps returned with error but 882 * since the remote machine might not always be able 883 * to send the address on all transports, we try the 884 * regular way with regular_rpcbind 885 */ 886 goto regular_rpcbind; 887 } else if ((clnt_st == RPC_PROGVERSMISMATCH) || 888 (clnt_st == RPC_PROGUNAVAIL)) { 889 start_vers = RPCBVERS; /* Try version 3 now */ 890 goto regular_rpcbind; /* Try different versions */ 891 } else { 892 rpc_createerr.cf_stat = RPC_PMAPFAILURE; 893 clnt_geterr(client, &rpc_createerr.cf_error); 894 goto error; 895 } 896 } 897 898 regular_rpcbind: 899 900 /* Now the same transport is to be used to get the address */ 901 #if 1 902 if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || 903 (nconf->nc_semantics == NC_TPI_COTS))) 904 #else 905 if (client && nconf->nc_semantics == NC_TPI_CLTS) 906 #endif 907 { 908 /* A CLTS type of client - destroy it */ 909 CLNT_DESTROY(client); 910 client = NULL; 911 } 912 913 if (client == NULL) { 914 client = getclnthandle(host, nconf, &parms.r_addr); 915 if (client == NULL) { 916 goto error; 917 } 918 } 919 if (parms.r_addr == NULL) 920 parms.r_addr = __UNCONST(&nullstring[0]); 921 922 /* First try from start_vers and then version 3 (RPCBVERS) */ 923 for (vers = start_vers; vers >= RPCBVERS; vers--) { 924 /* Set the version */ 925 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 926 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, 927 (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, 928 (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, 929 tottimeout); 930 if (clnt_st == RPC_SUCCESS) { 931 if ((ua == NULL) || (ua[0] == 0)) { 932 /* address unknown */ 933 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; 934 goto error; 935 } 936 address = uaddr2taddr(nconf, ua); 937 #ifdef ND_DEBUG 938 fprintf(stderr, "\tRemote address is [%s]\n", ua); 939 if (!address) 940 fprintf(stderr, 941 "\tCouldn't resolve remote address!\n"); 942 #endif 943 xdr_free((xdrproc_t)xdr_wrapstring, 944 (char *)(void *)&ua); 945 946 if (! address) { 947 /* We don't know about your universal address */ 948 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; 949 goto error; 950 } 951 CLNT_CONTROL(client, CLGET_SVC_ADDR, 952 (char *)(void *)&servaddr); 953 __rpc_fixup_addr(address, &servaddr); 954 goto done; 955 } else if (clnt_st == RPC_PROGVERSMISMATCH) { 956 struct rpc_err rpcerr; 957 958 clnt_geterr(client, &rpcerr); 959 if (rpcerr.re_vers.low > RPCBVERS4) 960 goto error; /* a new version, can't handle */ 961 } else if (clnt_st != RPC_PROGUNAVAIL) { 962 /* Cant handle this error */ 963 rpc_createerr.cf_stat = clnt_st; 964 clnt_geterr(client, &rpc_createerr.cf_error); 965 goto error; 966 } 967 } 968 969 error: 970 if (client) { 971 CLNT_DESTROY(client); 972 client = NULL; 973 } 974 done: 975 if (nconf->nc_semantics != NC_TPI_CLTS) { 976 /* This client is the connectionless one */ 977 if (client) { 978 CLNT_DESTROY(client); 979 client = NULL; 980 } 981 } 982 if (clpp) { 983 *clpp = client; 984 } else if (client) { 985 CLNT_DESTROY(client); 986 } 987 return (address); 988 } 989 990 991 /* 992 * Find the mapped address for program, version. 993 * Calls the rpcbind service remotely to do the lookup. 994 * Uses the transport specified in nconf. 995 * Returns FALSE (0) if no map exists, else returns 1. 996 * 997 * Assuming that the address is all properly allocated 998 */ 999 int 1000 rpcb_getaddr(program, version, nconf, address, host) 1001 rpcprog_t program; 1002 rpcvers_t version; 1003 const struct netconfig *nconf; 1004 struct netbuf *address; 1005 const char *host; 1006 { 1007 struct netbuf *na; 1008 1009 _DIAGASSERT(address != NULL); 1010 1011 if ((na = __rpcb_findaddr(program, version, nconf, 1012 host, NULL)) == NULL) 1013 return (FALSE); 1014 1015 if (na->len > address->maxlen) { 1016 /* Too long address */ 1017 free(na->buf); 1018 free(na); 1019 rpc_createerr.cf_stat = RPC_FAILED; 1020 return (FALSE); 1021 } 1022 memcpy(address->buf, na->buf, (size_t)na->len); 1023 address->len = na->len; 1024 free(na->buf); 1025 free(na); 1026 return (TRUE); 1027 } 1028 1029 /* 1030 * Get a copy of the current maps. 1031 * Calls the rpcbind service remotely to get the maps. 1032 * 1033 * It returns only a list of the services 1034 * It returns NULL on failure. 1035 */ 1036 rpcblist * 1037 rpcb_getmaps(nconf, host) 1038 const struct netconfig *nconf; 1039 const char *host; 1040 { 1041 rpcblist_ptr head = NULL; 1042 CLIENT *client; 1043 enum clnt_stat clnt_st; 1044 rpcvers_t vers = 0; 1045 1046 client = getclnthandle(host, nconf, NULL); 1047 if (client == NULL) { 1048 return (head); 1049 } 1050 clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1051 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1052 (char *)(void *)&head, tottimeout); 1053 if (clnt_st == RPC_SUCCESS) 1054 goto done; 1055 1056 if ((clnt_st != RPC_PROGVERSMISMATCH) && 1057 (clnt_st != RPC_PROGUNAVAIL)) { 1058 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1059 clnt_geterr(client, &rpc_createerr.cf_error); 1060 goto done; 1061 } 1062 1063 /* fall back to earlier version */ 1064 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1065 if (vers == RPCBVERS4) { 1066 vers = RPCBVERS; 1067 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1068 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, 1069 (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, 1070 (char *)(void *)&head, tottimeout) == RPC_SUCCESS) 1071 goto done; 1072 } 1073 rpc_createerr.cf_stat = RPC_RPCBFAILURE; 1074 clnt_geterr(client, &rpc_createerr.cf_error); 1075 1076 done: 1077 CLNT_DESTROY(client); 1078 return (head); 1079 } 1080 1081 /* 1082 * rpcbinder remote-call-service interface. 1083 * This routine is used to call the rpcbind remote call service 1084 * which will look up a service program in the address maps, and then 1085 * remotely call that routine with the given parameters. This allows 1086 * programs to do a lookup and call in one step. 1087 */ 1088 enum clnt_stat 1089 rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp, 1090 xdrres, resp, tout, addr_ptr) 1091 const struct netconfig *nconf; /* Netconfig structure */ 1092 const char *host; /* Remote host name */ 1093 rpcprog_t prog; 1094 rpcvers_t vers; 1095 rpcproc_t proc; /* Remote proc identifiers */ 1096 xdrproc_t xdrargs, xdrres; /* XDR routines */ 1097 const char *argsp; /* Argument */ 1098 caddr_t resp; /* Result */ 1099 struct timeval tout; /* Timeout value for this call */ 1100 const struct netbuf *addr_ptr; /* Preallocated netbuf address */ 1101 { 1102 CLIENT *client; 1103 enum clnt_stat stat; 1104 struct r_rpcb_rmtcallargs a; 1105 struct r_rpcb_rmtcallres r; 1106 rpcvers_t rpcb_vers; 1107 1108 stat = RPC_FAILED; /* XXXGCC -Wuninitialized [dreamcast] */ 1109 1110 client = getclnthandle(host, nconf, NULL); 1111 if (client == NULL) { 1112 return (RPC_FAILED); 1113 } 1114 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, __UNCONST(&rmttimeout)); 1115 a.prog = prog; 1116 a.vers = vers; 1117 a.proc = proc; 1118 a.args.args_val = argsp; 1119 a.xdr_args = xdrargs; 1120 r.addr = NULL; 1121 r.results.results_val = resp; 1122 r.xdr_res = xdrres; 1123 1124 for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { 1125 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); 1126 stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, 1127 (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, 1128 (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); 1129 if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { 1130 struct netbuf *na; 1131 na = uaddr2taddr(__UNCONST(nconf), r.addr); 1132 if (!na) { 1133 stat = RPC_N2AXLATEFAILURE; 1134 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1135 goto error; 1136 } 1137 if (na->len > addr_ptr->maxlen) { 1138 /* Too long address */ 1139 stat = RPC_FAILED; /* XXX A better error no */ 1140 free(na->buf); 1141 free(na); 1142 ((struct netbuf *)__UNCONST(addr_ptr))->len = 0; 1143 goto error; 1144 } 1145 memcpy(addr_ptr->buf, na->buf, (size_t)na->len); 1146 ((struct netbuf *)__UNCONST(addr_ptr))->len = na->len; 1147 free(na->buf); 1148 free(na); 1149 break; 1150 } else if ((stat != RPC_PROGVERSMISMATCH) && 1151 (stat != RPC_PROGUNAVAIL)) { 1152 goto error; 1153 } 1154 } 1155 error: 1156 CLNT_DESTROY(client); 1157 if (r.addr) 1158 xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); 1159 return (stat); 1160 } 1161 1162 /* 1163 * Gets the time on the remote host. 1164 * Returns 1 if succeeds else 0. 1165 */ 1166 bool_t 1167 rpcb_gettime(host, timep) 1168 const char *host; 1169 time_t *timep; 1170 { 1171 CLIENT *client = NULL; 1172 void *handle; 1173 struct netconfig *nconf; 1174 rpcvers_t vers; 1175 enum clnt_stat st; 1176 1177 1178 if ((host == NULL) || (host[0] == 0)) { 1179 time(timep); 1180 return (TRUE); 1181 } 1182 1183 if ((handle = __rpc_setconf("netpath")) == NULL) { 1184 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1185 return (FALSE); 1186 } 1187 rpc_createerr.cf_stat = RPC_SUCCESS; 1188 while (client == NULL) { 1189 if ((nconf = __rpc_getconf(handle)) == NULL) { 1190 if (rpc_createerr.cf_stat == RPC_SUCCESS) 1191 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1192 break; 1193 } 1194 client = getclnthandle(host, nconf, NULL); 1195 if (client) 1196 break; 1197 } 1198 __rpc_endconf(handle); 1199 if (client == NULL) { 1200 return (FALSE); 1201 } 1202 1203 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1204 (xdrproc_t) xdr_void, NULL, 1205 (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); 1206 1207 if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { 1208 CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); 1209 if (vers == RPCBVERS4) { 1210 /* fall back to earlier version */ 1211 vers = RPCBVERS; 1212 CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); 1213 st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, 1214 (xdrproc_t) xdr_void, NULL, 1215 (xdrproc_t) xdr_int, (char *)(void *)timep, 1216 tottimeout); 1217 } 1218 } 1219 CLNT_DESTROY(client); 1220 return (st == RPC_SUCCESS? TRUE: FALSE); 1221 } 1222 1223 /* 1224 * Converts taddr to universal address. This routine should never 1225 * really be called because local n2a libraries are always provided. 1226 */ 1227 char * 1228 rpcb_taddr2uaddr(nconf, taddr) 1229 struct netconfig *nconf; 1230 struct netbuf *taddr; 1231 { 1232 CLIENT *client; 1233 char *uaddr = NULL; 1234 1235 1236 /* parameter checking */ 1237 if (nconf == NULL) { 1238 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1239 return (NULL); 1240 } 1241 if (taddr == NULL) { 1242 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1243 return (NULL); 1244 } 1245 client = local_rpcb(); 1246 if (! client) { 1247 return (NULL); 1248 } 1249 1250 CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, 1251 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1252 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); 1253 CLNT_DESTROY(client); 1254 return (uaddr); 1255 } 1256 1257 /* 1258 * Converts universal address to netbuf. This routine should never 1259 * really be called because local n2a libraries are always provided. 1260 */ 1261 struct netbuf * 1262 rpcb_uaddr2taddr(nconf, uaddr) 1263 struct netconfig *nconf; 1264 char *uaddr; 1265 { 1266 CLIENT *client; 1267 struct netbuf *taddr; 1268 1269 1270 /* parameter checking */ 1271 if (nconf == NULL) { 1272 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 1273 return (NULL); 1274 } 1275 if (uaddr == NULL) { 1276 rpc_createerr.cf_stat = RPC_UNKNOWNADDR; 1277 return (NULL); 1278 } 1279 client = local_rpcb(); 1280 if (! client) { 1281 return (NULL); 1282 } 1283 1284 taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); 1285 if (taddr == NULL) { 1286 CLNT_DESTROY(client); 1287 return (NULL); 1288 } 1289 if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, 1290 (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, 1291 (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, 1292 tottimeout) != RPC_SUCCESS) { 1293 free(taddr); 1294 taddr = NULL; 1295 } 1296 CLNT_DESTROY(client); 1297 return (taddr); 1298 } 1299